RU169886U1 - DEVICE FOR REMOVING USEFUL COMPONENTS BY PERCOLATION LEACHING - Google Patents

Abstract

The claimed utility model relates to the field of inorganic chemistry, in particular to devices for chemical leaching of non-ferrous, rare and noble metals, and can be used in enterprises processing man-made materials, as a rule, with a low content of target components, in particular, deactivated catalysts of various industries chemical and petrochemical profiles, as well as spent automotive catalysts. A device for extracting useful components of percolation leach characterized by the fact that it consists of a casing made in the form of a vertically mounted column, consisting of two shells - the bottom (2), equipped with a nozzle for supplying a leach solution (3), and an upper (1) with a nozzle for discharging a productive solution (5) and with an airlift installed inside it (4), while the shells are interconnected by flanges between which a false bottom is installed with a grid (6) with a mesh size less than the minimum grain size of the processed raw materials, and the height of the lower shell (2) does not exceed 10% of heights top shell (1). The technical result is to increase the concentration of target components in the productive solution and, accordingly, reduce the volume of solutions requiring disposal.

Description

Technical field

The claimed utility model relates to the field of inorganic chemistry, in particular to devices for chemical leaching of non-ferrous, rare and noble metals, and can be used in enterprises processing man-made materials, as a rule, with a low content of target components, in particular, deactivated catalysts of various industries chemical and petrochemical profiles, as well as spent automotive catalysts.

State of the art

The closest in essence and the technical result achieved is the device described in the patent for utility model RU 117438 U1, June 27, 2012, B01J 8/16, which discloses a device for leaching useful components from a solid material with a solvent, containing a column with plates of failure type , the upper part of which has an overflow threshold covered by a chamber with nozzles for feeding solid material into the column and draining the solution obtained by leaching, and the lower part with nozzles for feeding solvent and discharge dissolved solid material is in communication with a pulsation chamber connected to a pulsation source, characterized in that the plates are collected in packages in which adjacent plates are spaced by cylindrical shells, and the packages are installed in a column with an annular gap covered by a partition at the top of the package.

Utility Model Disclosure

The technical problem to be solved by the claimed technical device is to increase the productivity of the device while simplifying its design.

This problem is solved due to the fact that the device for extracting useful components by percolation leaching (Fig. 1) according to the utility model consists of a housing made in the form of a vertically mounted column consisting of two shells interconnected by flanges between which a false bottom with mesh (6) with a mesh size less than the minimum grain size of the processed raw materials. The lower shell (2) is equipped with a nozzle for supplying a leach solution (3), and an airlift (4) is installed in the upper shell (1) for unloading the contents of its bottom part and a nozzle for discharging the productive solution (5).

The lower shell (2) is used to receive and create a leach solution stream uniform in horizontal cross section, which contributes to a better flow of the leaching process in the bottom part of the upper shell (1) and, as a result, an increase in the concentration of target components in the productive solution. It was experimentally determined that the task is solved if the height of the lower shell is 8 ÷ 10% of the height of the upper shell.

In a particular embodiment, the lower shell may be in the form of a cylinder or cone.

The technical result, the solution of which the claimed solution is directed, is to increase the concentration of target components in the productive solution and, accordingly, reduce the volume of solutions requiring disposal.

Utility Model Implementation

A device for extracting useful components by percolation leaching works as follows.

The upper shell (1) is filled with raw materials, and the leaching solution of a certain composition and predetermined temperature is supplied at a certain speed to the lower shell (2) by a pump or other method. The leaching solution passes through a layer of raw materials, extracts the target components, is discharged through a drain pipe of the output of the productive solution (5), located at the top of the upper shell (1), and goes for further processing. After certain periods of time, the contents of the lower part of the device (20-30% of the volume of the upper shell) by airlift (4) are unloaded into a device for separating the solution from the solid phase, for example, into a suction filter, and filtered. The leach cake (8) obtained in this way is sent for disposal, and the filtered solution is returned for leaching. Thus, the feedstock and the solution move countercurrently, which, at their optimal flows, ensures the maximum possible concentration of the target component in the leach solution and the minimum residual content of the target components in the cakes.

Example

A device for extracting platinum, palladium, or rhenium from spent alumina-based catalysts by percolation leaching is a column made of a titanium pipe with a diameter of 400 mm and a height of 4000 mm, consisting of two shells, of which the upper one has a height of 3650 mm and the lower one 350 mm The shells are connected by flanges, between which a perforated false bottom is installed, covered with a polypropylene mesh with mesh sizes obviously smaller than the grain sizes of the catalyst. In the upper shell (1), an airlift (4) is installed from a titanium pipe with a diameter of 57 mm, and the lower end of the airlift is approximately 100 mm above the false bottom. A nozzle for injecting the leach solution (3) is cut into the lower shell (2), and a nozzle for discharging the productive solution (5) is located in the upper shell (1), which is located at a distance of 250 mm from the upper edge of the upper shell.

The upper shell (1) is filled with spent catalyst with a platinum concentration of 0.27%. A diluted solution of aqua regia heated to a temperature of 90 ÷ 95 ° C is fed into the lower shell by an air-membrane pump (7) at a speed of 50 l / h. The solution passes through a catalyst bed, extracts platinum, is discharged through a drainage device, and is fed for further processing. Every hour, from 40 to 50 liters of catalyst cake (8) are unloaded into the suction filter from the lower part of the upper shell (1) by an airlift (4) and the same volume of fresh catalyst is loaded from above. In the steady state, the concentration of platinum in the productive solution and in the cake of the catalyst is 1.5–3 g / l and 0.002–0.004%, respectively, which corresponds to the recovery of platinum from the catalyst 98.5–99.2%.

Claims (2)

1. A device for extracting useful components by percolation leaching, characterized in that it consists of a housing made in the form of a vertically mounted column, consisting of two shells - the bottom, equipped with a nozzle for supplying a leach solution, and the upper one with a nozzle for outputting the productive solution and with installed inside it with an airlift, while the shells are interconnected by flanges, between which a false bottom is installed with a mesh with a mesh size less than the minimum grain size of the processed about raw materials, and the height of the lower shell does not exceed 10% of the height of the upper shell. 2. The device according to claim 1, characterized in that the lower shell has the shape of a cylinder or cone.

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